package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;
    /**
     * 套餐分页查询
     * @param setmealPageQueryDTO
     * @return
     */
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {

        // 使用 pageHelper插件 进行分页
        PageHelper.startPage(setmealPageQueryDTO.getPage(),setmealPageQueryDTO.getPageSize());

        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);

        return new PageResult(page.getTotal(), page.getResult());


    }

    /**
     * 根据ID查询套餐
     * @param id
     * @return
     */
    public SetmealVO getById(Long id) {
        SetmealVO setmealVO = setmealMapper.getById(id);
        List<SetmealDish> setmealDishList = setmealDishMapper.getBySetmealId(id);
        setmealVO.setSetmealDishes(setmealDishList);
        return setmealVO;
    }

    /**
     * 修改套餐
     */
    @Transactional
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);
        // 修改套餐信息
        setmealMapper.update(setmeal);

        Long setmealId = setmeal.getId();

        // 删除套餐原对应的菜品信息
        setmealDishMapper.deleteBySetmealId(setmealId);

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if(setmealDishes != null && setmealDishes.size() > 0){
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmealId);
            });
            // 插入套餐新对应的菜品信息
            setmealDishMapper.insert(setmealDishes);
        }

    }

    /**
     * 新增套餐
     * @param setmealDTO
     */
    @Transactional
    public void save(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();

        BeanUtils.copyProperties(setmealDTO,setmeal);

        setmealMapper.insert(setmeal);

        // 获取insert语句生成的主键值
        Long setmealId = setmeal.getId();

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if(setmealDishes != null && setmealDishes.size() > 0){
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmealId);
            });
            // 向套餐表插入n条菜品数据
            setmealDishMapper.insert(setmealDishes);
        }
    }

    /**
     * 套餐起售、停售
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {

        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if(status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    /**
     * 批量删除套餐
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {

        ids.forEach(id ->{
            SetmealVO setmealVO = setmealMapper.getById(id);
            if(setmealVO.getStatus() == StatusConstant.ENABLE){
                // 起售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });

        // 符合条件可以删除
        ids.forEach(id->{
            // 删除套餐表中的信息
            setmealMapper.delete(id);
            // 删除套菜菜品表中关联的菜品信息
            setmealDishMapper.deleteBySetmealId(id);
        });

    }

    /**
     * 根据分类ID查询套餐
     * @param setmeal
     * @return
     */
    public List<Setmeal> getByCategoryId(Setmeal setmeal) {
        return setmealMapper.list(setmeal);
    }

    /**
     * 根据套餐id查询包含的菜品
     * @param setmealId
     * @return
     */
    public List<DishItemVO> getBySetmealId(Long setmealId) {
        return setmealDishMapper.getDishItemBySetmealId(setmealId);
    }
}
